As most people do, I carry several plastic gas cans on the truck to keep the mowers and line trimmers going.
Besides having gas cans that heat up and swell, they have to be kept locked up keeping them from others who have no problem taking them off my hands, so, I thought I would put this out for others to comment on,
I know there has to be a better and safer way to carry fuel in the line of business,
I have thought of an auxiliary fuel tank
(like the RVer's and farmers use in the back of the truck)
What's your preferred way of carrying extra fuel?

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Hank's Lawn Care Service
“Beautifying Lee County One Lawn at a Time”

The problem I see with this is that it can still swell and with it being locked and confined there could be the chance for it to explode or burst. I am looking into gettin a fuel transfer tank to keep in my truck

I bought 3 x 5 gallon metal safety cans from lowes. I keep them in a locked tool box and I don't have any problems with fumes because they have a pretty good spring to keep the lid closed on the cans. I find that the aluminum tool box keeps the cans much cooler so there's no swelling.